Raven Luni
- Oct 15, 2011
- 798
- Joined
- Oct 15, 2011
- Messages
- 798
Greetings,
This is related to my current bat detector project but it seems to merit a topic of its own since its a discussion about a particular component on its own.
Anyway, after noticing a weak output from the Q2 pin (the 4 bit), I took some measurements. The state was changing between about 4.2V and 4.8V. The other outputs were fine (changing between approx 5V and a few millivolts). I also noticed a resistance of about 7.2k bwtween Q2 and the count up pin. (all other resistances between outputs and this pin read either infinite or several Megohms.)
All outputs are completely isolated and not connected to anything else. So - is it fried, or is there maybe something quirky about the internals of this IC anyone here would know about?
Being in a hurry I soldered it directly to the board instead of using a socket, so if it comes to the worst I suppose I could compensate by offsetting and amplifying.
This is related to my current bat detector project but it seems to merit a topic of its own since its a discussion about a particular component on its own.
Anyway, after noticing a weak output from the Q2 pin (the 4 bit), I took some measurements. The state was changing between about 4.2V and 4.8V. The other outputs were fine (changing between approx 5V and a few millivolts). I also noticed a resistance of about 7.2k bwtween Q2 and the count up pin. (all other resistances between outputs and this pin read either infinite or several Megohms.)
All outputs are completely isolated and not connected to anything else. So - is it fried, or is there maybe something quirky about the internals of this IC anyone here would know about?
Being in a hurry I soldered it directly to the board instead of using a socket, so if it comes to the worst I suppose I could compensate by offsetting and amplifying.